[vtkusers] Problem with using vtkJPEGWriter

[Ravi Samala]

hi Bruno,
 
I used vtkPNGWriter instead of vtkJPEGWriter, but still the final image complete black !
 
what could be wrong ?
 
Thank you,
Ravi

Bruno da Silva de Oliveira <bruno at esss.com.br> wrote:
Hi,

Didn't actually read your code, but what happens if you use a 
vtkPNGWriter instead? Does the resulting image look correct?

Regards,

Ravi Samala wrote:

> Dear /VTKUser's/,
>
> 
>
> *Objective*: To write some data to a JPEG file.
>
> *Problem*: The final image is black color !
>
> 
>
> 
>
> The code is as follows:
>
> 
>
> //****************************************************
>
> // ***** Used to read 16 bit Image *****
>
> //****************************************************
>
> *vtkVolume16Reader *v16Img = vtkVolume16Reader::New(); *
>
> v16Img->SetDataDimensions (sizex,sizey);
>
> v16Img->SetImageRange (atoi(argv[3]),atoi(argv[4]));//Specify 
> the number of slices to read
>
> v16Img->SetHeaderSize(HeadS); // Specify the number of bytes to 
> seek over at start of image
>
> v16Img->SetFilePrefix (argv[2]); //Specify the File prefix of 
> all the slices (files)
>
> v16Img->SetDataSpacing (0.1, 0.1, 0.5); 
> //Resolution along X, Y and Z axis
>
> v16Img->SetDataOrigin(0, 0, 0);
>
> 
>
> //****************************************************
>
> // ***** Extracting a slice from the 3D volume *****
>
> //****************************************************
>
> *vtkImageReslice *imgResliceIn = vtkImageReslice::New(); *
>
> imgResliceIn->SetInput(v16Img -> GetOutput());
>
> imgResliceIn->SetOutputSpacing(1,1,1);
>
> imgResliceIn->SetInterpolationModeToLinear();
>
> imgResliceIn->SetOutputOrigin(0, 0, 10);
>
> imgResliceIn->SetOutputExtent(0,312,0,499,0,0);
>
> 
>
> //****************************************************
>
> // ***** Scaling the pixel range ******
>
> //****************************************************
>
> *vtkImageShiftScale *imgShSc =vtkImageShiftScale::New();*
>
> imgShSc->SetInput(imgResliceIn -> GetOutput());
>
> imgShSc->SetScale(256/13000);
>
> /// $$ The input image pixel range is from 0 to 13000./
>
> /// $$ I wanted to convert the range from (0-13000)/
>
> /// $$ to (0-255)./
>
> 
>
> //****************************************************
>
> // ***** Converting to Unsigned Char for JPEG writer *
>
> //****************************************************
>
> *vtkImageCast *imgCastIn = vtkImageCast::New();*
>
> imgCastIn->SetInput(imgShSc -> GetOutput());
>
> imgCastIn->SetOutputScalarTypeToUnsignedChar(); 
>
> 
>
> //****************************************************
>
> *vtkJPEGWriter *jpegWrIn = vtkJPEGWriter::New();*
>
> jpegWrIn->SetInput(imgCastIn -> GetOutput());
>
> jpegWrIn->SetFileName("Input10.jpg");
>
> jpegWrIn->Write();
>
> //****************************************************
>
> 
>
> 
>
> Thank you,
>
> 
>
> Ravi.
>
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> 
>
>
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>
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-- 
Bruno da Silva de Oliveira
bruno at esss.com.br
ESSS - Engineering Simulation and Scientific Software
http://www.esss.com.br

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